Manufacture of boxes



March-15, 1938. 7 A. M. KAMPER I 2,111,474

MANUFACTURE OF BOXES Filed Aug. 28, 1936 4 Sheets-Sheet 1 INVENTQR 13 By ANDREW M. KAMPER 7rrrvvfiafimw ATTORNEYS March 15, 1938 A. M. KAMPER 2,111,474

' MANUFACTURE OF soxas Filed Aug. 28, 1936 4 Sheets-Sheet 2 INVENTOR ANDREW M KAMPER ATTORNEYS March 15, 1938. A. M. KAMPER 2,111,474

MANUFACTURE OF BOXES Filed Aug. 28, 1956 4 Sheets-Sheet 5 INVEN'IOR ANDREW M- KAMP'ER By v 73% ATTORNEYS March 15, 1938. A, M KA PER 2,111,474

MANUFACTURE OF BOXES Filed Aug. 28, 1956 4 Sheets-Sheet 4 INVENTOR ANDREW M. KAMPER By V fla w w ATTORNEYS Patented Mars 15, 1938 UNITED STATES PATENT oFFlo-s MANUFACTURE OF BOXES of Australia Application August 28, 1936, Serial No. 98,383 In Great Britain July 9, 1936 8 Claims.

This invention relates to improvements in the manufacture of boxes of foldable material such as cardboard.

Among the objects of the invention are to pro= duce a box having greater strength, rigidity and resistance than hitherto obtainable with: boxes of cardboard and the like foldable material.

It is known to provide box blanks of cardbo d with metal strips along their opposite sides whereby, when the blanks are folded up into form, the cardboard box is stiffened and the end Walls of the box can be secured in position.

in known boxes of this kind the metal sti' have sometimes been attached to the cardbo by means of teeth integral "with the metal s" and sometimes by means of rivets.

The present invention consists in a box; bl of cardboard or the like folding material which metal strips at each side of the blank e brace and hold tightly a double thickness of blank material, viz. on the one hand the bore of the body portion which is adapted to fold to form the front, bottom, back and top of one box, and on, the other hand the borders of 11-2 adapted either to form the ends oi the box 0.". lie against and reinforce the ends of the box on the inside and to hold them in position.

The end-forming or reinforcing parts of the folding blank may be in one piece with the parts forming the front, bottom and so on, the former being lateral extensions upon the latter, and doubled over thereon, or the end-forming parts may be cut separately from the remainder of the blank.

Each metal strip is preferably afixed to t" cardboard or other ioldable material by beln clenched tightly thereon longitudinally of th strip, without the use of teeth, staples or rivets, and thereby the risk is avoided or" the strip be coming detached owing to the teeth or rivets tearing the box material or cutting through it.

Preferably it is the middle portion only of the metal strip which is clenched onto the cardboard, a border portion on either side of the clenched portion being adapted to lie upon the material of the box in planes substantially at right-angles to one another.

In the accompanying drawings the invention is illustrated as applied to a variety of types of blanks and boxes.

Fig. 1 shows a cardboard blank cut out for one form of box.

Fig. 2 shows the edges of the blank folded ready to receive the metal strip.

Fig. 3 is a sectional view of one form of strip which. may be employed according to the present invention, before it is clenched on the cardboard blank.

Fig. 4 is a sectional view of the strip clenched onto the blank, showing also the position occupied by the end wall of the box with this form or blank.

Fig. 5 is a view of the outerside of the blank with the two metal strips in position along each side.

6 shows an alternative -form of cardboard blank, bent up in the manner of Fig. 2, but with the end flap also bent up and therefore adapted to take a metal strip in one piece along one side, across the end, and along the other side, instead of in two separate pieces along the sides as in the previous case.

7 shows a blank of this form with the metal strip clenched in position thereon.

shows this form of blank made up into u a box and completed with end walls.

9 illustrates how a box of the type 01' Figs. l-5 may conveniently be closed.

fill llnstrates how a box blank may be made up of a rectangular body portion and separate side members, instead of integral side members as in Figs. 1 s, but to produce a blank of different shape and arrangement from those of the earlier figures, and having the end walls as part 01" the blank. 0

Fig. ll is a detail sectional view oi the assem-= a bly of the blank according to Fig. 10, illustrating also an alternative form of metal strip.

12 illustrates diagrammatically how the side portions co-operate to form an end wall.

Fig. 13 is a view of a completed box, using the blank shown in "Fig. 12.

In Fig. l, the cardboard blank comprises a rectangular main or body portion l made up of lid 2, back wall 3, bottom t and front wall a closure flap 5, and side portions '5, between which are mitre cuts 8. The blank is creased along the lines 9, 9, to allow it to be readily foldedtransversely, and also along lines it, it to allow the side portions to be folded longitudinally into the forms shown in Fig. 2. There are thus formed along the two sides of the blank folded or double thickness portions ll, ii and onto these are secured the metal binding strips. Fig. 3 shows the profile of one form of strip that may be used. it has a longitudinally central channel portion ii, at either side of which are substantially arcuate section border portions l3 and 84. The strip for each side of the box is notched at points corresponding to the mitre cuts 8 in the cardboard blank, the notches extending through the border portion 14 and the central channel portion. The metal strips are fitted over the doubled edges ll of the blank, with the doubled edges lying within the channel portions l2 of the strips, and the strips are then closed up, asshown in Fig. 4, with the channel portion i2 firmly clenched upon the doubled edges II, and the two border portions l3 and I4 of the strip lying in planes substantially at right-angles to one another. The whole blank with metal strips attached is shown in Fig. 5 in a position the reverse of Fig. 2. The strips may be closed down on the blanks by passing them between pressure rollers.

In Figs. 6 and 7 is shown a cardboard blank of slightly different form and in Fig. 7 is shown the same with a metal strip in one piece attached thereto. It will be seen that the lid flap 6 is here bent over also, in the same way as the side portions 1 of the blank, and the metal strip is clenched onto the folded or doubled portions Ii, ll all round the blank except at the right-hand end in Fig. 6. 1 1g. 7 shows the blank with the strip attached. For this pattern of blank the strip has to be notched not only as before through the border 14 and central channel portion I2, but also, at the two front corners, through the border I! and channel portion i2. At the corners where the border ll of the strip is uninterrupted, to

keep the strip unbroken, the border is bent up to form transverse channel portions l4. When the blank is bent up into box form as shown in Fig. 8, these parts l4 fit over the parts l4" of the ends of the strip. The ends of the blank may then be secured together (i. e. the lid may be fastened down) by indenting or piercing the overlapped parts l4 and I4". The lid fiap 6 in this arrangement of blank is preferably passed inside the box when the lid is closed down.

Fig. 9 shows how the box lid can be fastened down when the blank is of the form shown in Fig. 5. An arcuate plate It is passed through slots I! in the lid and front wall metal strips, and

the ends of the plate are bent over. The fiap 6 is stuck down on the front wall 5.

With blanks of the type illustrated in l igs.

1-7, the end walls of the box may be held between the borders of the metal strip and the upturned side portions I of the cardboard blank, this arrangement is illustrated in Fig. 4, where the position of an end wall is shown in dotted lines at IS. The end walls I5 are shown in position in Fig. 8. The side portions I are of course not rigid on the blank, but in conjunction with the goods packed in the box they serve to hold the end walls in position, and, if required to hold the end walls more positively, they may be wire stitched to the end walls or attached thereto by means of an adhesive. The end walls may be of cardboard, or of 3-ply wood, as it may be desirable to have them of slightly stiffer material than the blank. The strip borders 1: and I4 lying upon the sides and ends of the box, keep the strip from twisting upon the double edges of cardboard on which the strip is clamped.

To cut blanks of. the form shown in Figs. 1-7, with the side portions 1 all in one with the rectangular body portion of the blank, stamping dies are required, and to avoid the expense of numerous dies to suit different dimension of box, the blanks may be made up of a rectangular body portion and separately prepared side portions Inl'ig. 10 one form ofsuchcompositeblankis illustrated, which has a body portion comprising the lid part 2, back wall 2, bottom 4 and front wall 5, as before, with lid flap I. Separate side members 22, 24, 2!, and 22 are provided at each side, adapted to be attached by their edges or flanges to the body portion, by means of metal strips, in the manner illustrated in Fig. 11. With the form of metal strip here illustrated the edges of the body portion of the blank and the fianges of the side members are gripped tightly between the folds i2 and it of the metal strip. The grip may be made more positive by forcing indentati0ns2ll into the metal by means for instance of a toothed roller. The side members are shown in position on the main portion of the blank at the upper side of Fig. 10, and are shown detached at the lower side; in the former'case the side members are lying fiat, in the same plane as their attachment edges, and in the latter case bent up at right-angles to their edges. When the side members are all mounted on the portion of the blank as described, the blank is folded up on the dotted lines 9, I as before, the members 25 are raised vertical to form the end walls, the members 24 and 22 are laid against the inner sides of the members 2| (the members 24 and 28 may be of a size to abut when in position, but do not overlap one another),.and the members 23, as the lid is being closed, are passed in between the members 26 and the members 24 and 26. The lid flap 6 is folded down on the outside of the box and fixed by means of an adhesive.

In conjunction with the different constructions of boxes above described, and particularly with the arrangement shown in Fig. 10, it has been found of advantage to employ well known adhesive fixing means of the kind which renders two treated surfaces adhesive to one another, but leaves a treated surface non-adhesive to a nontreated surface. If for instance, part of the inner face of side member 25 is coated with a rubber solution, and parts of the outer surfaces of side members 24 and 28 are similarly coated, these coated surfaces will be, when dry, non-adhesive for any ordinary surface with which they may come in contact; but if placed in contact with one another and pressed together, they will firmly adhere. In Fig. 12 is illustrated diagrammatically the positions of the members 22, 24, 25, and 26 in the closed box. The rectangle A, B, C, D, represents the part 25, the figures A. B, E, F and D, C, G, H the parts 24 and 26 respectively. The shaded portions indicate the areas on the parts 25, 24, and 26 which are coated to render them mutually adhesive, and the position of the part 23 is indicated in dotted lines above the shaded portions.

The lid flap 6 may be similarly treated and also that part of the front wall of the box to which the flap is required to adhere.

It will be understood that when a number of blanks are being stacked in the fiat, with the side members folded down on the body portions, the coated surfaces must be kept out of contact with one another.

As a material for the box blank there may be used any compressible and foldable material such as cardboard or corrugated paper.

I claim:

1. A box blank of foldable material comprising a substantially rectangular body portion creased transversely and adapted to fold up into the front, bottom, back and top of a box, and on opposite sides of said front, bottom, back and top parts side members adapted to occupy in the completed box positions substantially at rightangles to said front, bottom, back and top parts respectively, and longitudinally folded metal strips running uninterruptedly along opposite sides of the blank and clamping together the borders oi. said body portion and of said side members.

2. A box blank as claimed in claim 1, in which the side members are cut separate from the body portion of the blank and attached thereto by the metal strips.

box are of equal width with the bottom and of equal height with the back and front of the box and the side members clamped on the parts of the I 3 blank which are adapted to form the back and front of the box are of such size that they donot overlap, and the side members which are adapted, when the box is made up, to contact with one another are rendered, over part of their contacting surfaces, mutually adhesive.

5. A box blank as claimed in claim 1, in which the metal strips which run uninterruptedly along the sides of the blank are the end sections of a metal strip of which the middle section runs across and is clamped to one end of the blank.

6. A box blank of f'oldable material comprising a substantially rectangular body portion creased transversely and adapted to fold up into the front, bottom, back and top of a box, and on opposite sides of the front, bottom and back parts, side members adapted to occupy in the completed box, positions substantially at right angles to said front, bottom and back parts respectively, and longitudinally folded metal strips running uninterruptedly along opposite sides of the blank and clamping together the borders of said body portion and said side members.

ANDREW MATHIS KAMPER. 

